BSOD problems

Hello there , just bought my computer about month or so. It worked fine for a week then i got BSOD's. been trying to fix it and checking things , but i cant seem to find the problem. Have run Memtest and no errors. Hope you guys could help me.

3. Ram looks right and the sticks are matching. Is the voltage set right, I'm asking because there is no way I could see your voltage. Sometimes RAM makers put a note about the voltage needing to be set manually, because the motherboard can default it to low.

Ok, RAM is set right, is matched and supported by the motherboard. Memtest shows 0 errors. sfc /scannow shows some things that can't be corrected. Have reinstalled the videocard driver with the latest version. Still crashes when Alt-Tab'ing to desktop. Videotests as Furmark pass without a glitch. Latest Catalysts is what you've tried and what you need for Radeon 6850.

1. Run this video memory test |MG| Video Memory Stress Test 1.7.116 Download 2. Disable the videocard in windows device manager, reboot and try out the system for BSOD's with the card disabled. 3. Consider upgrading bios to the latest version 4. System reinstall might be worth a try, but in 90% of the cases it fixes nothing.